﻿using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Runtime.Serialization;
using System.IO;
using System.Text;
using System.Net;
using System.Web.Security;
using LitJson;
/// <summary>
///JsApiPay 的摘要说明
/// </summary>

public class JsApiPay
{
    /// <summary>
    /// 保存页面对象，因为要在类的方法中使用Page的Request对象
    /// </summary>
    private Page page { get; set; }

    /// <summary>
    /// openid用于调用统一下单接口
    /// </summary>
    public string openid { get; set; }

    /// <summary>
    /// access_token用于获取收货地址js函数入口参数
    /// </summary>
    public string access_token { get; set; }

    /// <summary>
    /// 订单id
    /// </summary>
    public string orderid { get; set; }

    /// <summary>
    /// 商品详情
    /// </summary>
    public string productName { get; set; }

    /// <summary>
    /// 商品金额，用于统一下单
    /// </summary>
    public int total_fee { get; set; }

    /// <summary>
    /// 统一下单接口返回结果
    /// </summary>
    public WxPayData unifiedOrderResult { get; set; }

    public JsApiPay(Page page)
    {
        this.page = page;
    }


    /**
    * 
    * 网页授权获取用户基本信息的全部过程
    * 详情请参看网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
    * 第一步：利用url跳转获取code
    * 第二步：利用code去获取openid和access_token
    * 
    */
    public void GetOpenidAndAccessToken()
    {
        if (!string.IsNullOrEmpty(page.Request.QueryString["code"]))
        {
            //获取code码，以获取openid和access_token
            string code = page.Request.QueryString["code"];
            Log.Debug(this.GetType().ToString(), "Get code : " + code);
            GetOpenidAndAccessTokenFromCode(code);
        }
        else
        {
            //构造网页授权获取code的URL
            string host = page.Request.Url.Host;
            string path = page.Request.Path;
            string redirect_uri = HttpUtility.UrlEncode("http://" + host + path);
            WxPayData data = new WxPayData();
            data.SetValue("appid", WxPayConfig.APPID);
            data.SetValue("redirect_uri", redirect_uri);
            data.SetValue("response_type", "code");
            data.SetValue("scope", "snsapi_base");
            data.SetValue("state", "STATE" + "#wechat_redirect");
            string url = "https://open.weixin.qq.com/connect/oauth2/authorize?" + data.ToUrl();
            Log.Debug(this.GetType().ToString(), "Will Redirect to URL : " + url);
            try
            {
                //触发微信返回code码         
                page.Response.Redirect(url);//Redirect函数会抛出ThreadAbortException异常，不用处理这个异常
            }
            catch (System.Threading.ThreadAbortException ex)
            {
            }
        }
    }


    /**
    * 
    * 通过code换取网页授权access_token和openid的返回数据，正确时返回的JSON数据包如下：
    * {
    *  "access_token":"ACCESS_TOKEN",
    *  "expires_in":7200,
    *  "refresh_token":"REFRESH_TOKEN",
    *  "openid":"OPENID",
    *  "scope":"SCOPE",
    *  "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
    * }
    * 其中access_token可用于获取共享收货地址
    * openid是微信支付jsapi支付接口统一下单时必须的参数
    * 更详细的说明请参考网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
    * @失败时抛异常WxPayException
    */
    public void GetOpenidAndAccessTokenFromCode(string code)
    {
        try
        {
            //构造获取openid及access_token的url
            WxPayData data = new WxPayData();
            data.SetValue("appid", WxPayConfig.APPID);
            data.SetValue("secret", WxPayConfig.APPSECRET);
            data.SetValue("code", code);
            data.SetValue("grant_type", "authorization_code");
            string url = "https://api.weixin.qq.com/sns/oauth2/access_token?" + data.ToUrl();

            //请求url以获取数据
            string result = HttpService.Get(url);

            Log.Debug(this.GetType().ToString(), "GetOpenidAndAccessTokenFromCode response : " + result);

            //保存access_token，用于收货地址获取
            JsonData jd = JsonMapper.ToObject(result);
            access_token = (string)jd["access_token"];

            //获取用户openid
            openid = (string)jd["openid"];

            Log.Debug(this.GetType().ToString(), "Get openid : " + openid);
            Log.Debug(this.GetType().ToString(), "Get access_token : " + access_token);
        }
        catch (Exception ex)
        {
            Log.Error(this.GetType().ToString(), ex.ToString());
            throw new WxPayException(ex.ToString());
        }
    }

    /**
     * 调用统一下单，获得下单结果
     * @return 统一下单结果
     * @失败时抛异常WxPayException
     */
    public WxPayData GetUnifiedOrderResult()
    {
        //统一下单
        WxPayData data = new WxPayData();
        data.SetValue("body", productName);
        data.SetValue("attach", productName);
        data.SetValue("out_trade_no", orderid);//WxPayApi.GenerateOutTradeNo()
        data.SetValue("total_fee", total_fee);
        data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));
        data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));
        data.SetValue("goods_tag", productName);
        data.SetValue("trade_type", "JSAPI");
        data.SetValue("openid", openid);
        

        WxPayData result = WxPayApi.UnifiedOrder(data);
        if (!result.IsSet("appid") || !result.IsSet("prepay_id") || result.GetValue("prepay_id").ToString() == "")
        {
            Log.Error(this.GetType().ToString(), "UnifiedOrder response error!");
            throw new WxPayException("UnifiedOrder response error!");
        }

        unifiedOrderResult = result;
        return result;
    }

    /**
    *  
    * 从统一下单成功返回的数据中获取微信浏览器调起jsapi支付所需的参数，
    * 微信浏览器调起JSAPI时的输入参数格式如下：
    * {
    *   "appId" : "wx2421b1c4370ec43b",     //公众号名称，由商户传入     
    *   "timeStamp":" 1395712654",         //时间戳，自1970年以来的秒数     
    *   "nonceStr" : "e61463f8efa94090b1f366cccfbbb444", //随机串     
    *   "package" : "prepay_id=u802345jgfjsdfgsdg888",     
    *   "signType" : "MD5",         //微信签名方式:    
    *   "paySign" : "70EA570631E4BB79628FBCA90534C63FF7FADD89" //微信签名 
    * }
    * @return string 微信浏览器调起JSAPI时的输入参数，json格式可以直接做参数用
    * 更详细的说明请参考网页端调起支付API：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7
    * 
    */
    public string GetJsApiParameters()
    {
        Log.Debug(this.GetType().ToString(), "JsApiPay::GetJsApiParam is processing...");

        WxPayData jsApiParam = new WxPayData();
        jsApiParam.SetValue("appId", unifiedOrderResult.GetValue("appid"));
        jsApiParam.SetValue("timeStamp", WxPayApi.GenerateTimeStamp());
        jsApiParam.SetValue("nonceStr", WxPayApi.GenerateNonceStr());
        jsApiParam.SetValue("package", "prepay_id=" + unifiedOrderResult.GetValue("prepay_id"));
        jsApiParam.SetValue("signType", "MD5");
        jsApiParam.SetValue("paySign", jsApiParam.MakeSign());

        string parameters = jsApiParam.ToJson();

        Log.Debug(this.GetType().ToString(), "Get jsApiParam : " + parameters);
        return parameters;
    }


    /**
    * 
    * 获取收货地址js函数入口参数,详情请参考收货地址共享接口：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_9
    * @return string 共享收货地址js函数需要的参数，json格式可以直接做参数使用
    */
    public string GetEditAddressParameters()
    {
        string parameter = "";
        try
        {
            string host = page.Request.Url.Host;
            string path = page.Request.Path;
            string queryString = page.Request.Url.Query;
            //这个地方要注意，参与签名的是网页授权获取用户信息时微信后台回传的完整url
            string url = "http://" + host + path + queryString;

            //构造需要用SHA1算法加密的数据
            WxPayData signData = new WxPayData();
            signData.SetValue("appid", WxPayConfig.APPID);
            signData.SetValue("url", url);
            signData.SetValue("timestamp", WxPayApi.GenerateTimeStamp());
            signData.SetValue("noncestr", WxPayApi.GenerateNonceStr());
            signData.SetValue("accesstoken", access_token);
            string param = signData.ToUrl();

            Log.Debug(this.GetType().ToString(), "SHA1 encrypt param : " + param);
            //SHA1加密
            string addrSign = FormsAuthentication.HashPasswordForStoringInConfigFile(param, "SHA1");
            Log.Debug(this.GetType().ToString(), "SHA1 encrypt result : " + addrSign);

            //获取收货地址js函数入口参数
            WxPayData afterData = new WxPayData();
            afterData.SetValue("appId", WxPayConfig.APPID);
            afterData.SetValue("scope", "jsapi_address");
            afterData.SetValue("signType", "sha1");
            afterData.SetValue("addrSign", addrSign);
            afterData.SetValue("timeStamp", signData.GetValue("timestamp"));
            afterData.SetValue("nonceStr", signData.GetValue("noncestr"));

            //转为json格式
            parameter = afterData.ToJson();
            Log.Debug(this.GetType().ToString(), "Get EditAddressParam : " + parameter);
        }
        catch (Exception ex)
        {
            Log.Error(this.GetType().ToString(), ex.ToString());
            throw new WxPayException(ex.ToString());
        }

        return parameter;
    }
}
